U.S. patent number 6,598,538 [Application Number 09/971,134] was granted by the patent office on 2003-07-29 for rail wheel stop mechanism for road/rail vehicle.
This patent grant is currently assigned to Brandt Industries, Inc.. Invention is credited to Jeff Doka, Jim Semple.
United States Patent |
6,598,538 |
Semple , et al. |
July 29, 2003 |
Rail wheel stop mechanism for road/rail vehicle
Abstract
For use with a road/rail vehicle that is convertible from a road
mode for traveling on a road, to a rail mode for traveling on
rails, an apparatus for mounting a rail wheel to the vehicle. The
apparatus comprises an air bag bearing against the rail wheel and
the vehicle frame such that the vehicle frame is supported on the
rail wheel by the air bag and such that the vehicle frame can move
up and down with respect to the rail wheel in response to motion of
the vehicle along a set of rails. A stop mechanism is attached to
the vehicle frame and to the rail wheel and is operative to allow
the vehicle frame to move down with respect to the rail wheel only
to a stopped position where adjacent road wheels of the vehicle are
above the rails. A kit allows installation on existing road/rail
vehicles.
Inventors: |
Semple; Jim (Regina,
CA), Doka; Jeff (Regina, CA) |
Assignee: |
Brandt Industries, Inc.
(Regina, CA)
|
Family
ID: |
29216688 |
Appl.
No.: |
09/971,134 |
Filed: |
October 4, 2001 |
Current U.S.
Class: |
105/215.2;
105/215.1; 267/256; 280/124.116 |
Current CPC
Class: |
B60F
1/04 (20130101); B61F 5/325 (20130101) |
Current International
Class: |
B60F
1/04 (20060101); B60F 1/00 (20060101); B61F
5/32 (20060101); B61F 5/00 (20060101); B61F
002/00 () |
Field of
Search: |
;105/215.2,215.1,217,72.2,453 ;280/124.116,754
;267/256,64.12,35 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Le; Mark T.
Assistant Examiner: Jules; Frantz F.
Attorney, Agent or Firm: Frost Brown Todd LLC
Claims
We claim:
1. For use with a road/rail vehicle, the vehicle convertible from a
road mode for traveling on a road, to a rail mode for traveling on
a set of rails, an apparatus for mounting a rail wheel to the
vehicle, the apparatus comprising: an air bag; a source of
pressurized fluid operatively connected to the air bag to supply
pressurized fluid to the air bag such that the air bag bears
against the rail wheel and against a vehicle frame such that the
vehicle frame is supported on the rail wheel by the air bag and
such that the vehicle frame can move up and down with respect to
the rail wheel in response to motion of the vehicle along the set
of rails; a control operative to release pressurized fluid from the
air bag; an actuator operatively connected to the vehicle frame and
to the rail wheel, the actuator operative to selectively move the
rail wheel from a raised road mode position to a lowered rail mode
position; a stop mechanism attached to the vehicle frame and to the
rail wheel, the stop mechanism operative to allow the vehicle frame
to move down with respect to the rail wheel only to a stopped
position, wherein adjacent road wheels of the vehicle are above the
rails in the stopped position; and wherein the stop mechanism is
selectively operative to lock the rail wheel in the raised road
mode position.
2. For use with a road/rail vehicle, the vehicle convertible from a
road mode for traveling on a road, to a rail mode for traveling on
a set of rails, an apparatus for mounting a rail wheel to the
vehicle, the apparatus comprising: an air bag; a source of
pressurized fluid operatively connected to the air bag to supply
pressurized fluid to the air bag such that the air bag bears
against the rail wheel and against a vehicle frame such that the
vehicle frame is supported on the rail wheel by the air bag and
such that the vehicle frame can move up and down with respect to
the rail wheel in response to motion of the vehicle along the set
of rails; a control operative to release pressurized fluid from the
air bag; an actuator operatively connected to the vehicle frame and
to the rail wheel, the actuator operative to selectively move the
rail wheel from a raised road mode position to a lowered rail mode
position; a stop mechanism attached to the vehicle frame and to the
rail wheel, the stop mechanism operative to allow the vehicle frame
to move down with respect to the rail wheel only to a stopped
position, wherein adjacent road wheels of the vehicle are above the
rails in the stopped position; and wherein the stop mechanism
comprises: first and second brackets, one of the brackets fixed to
the rail wheel and the other fixed to the vehicle frame, the
brackets oriented to move up and down beside and in proximity to
each other; a stop member removably attached to the first bracket,
and extending toward the second bracket such that when the vehicle
frame moves down to the stopped position the second bracket comes
into contact with the stop member and prevents the vehicle frame
from moving further downward with respect to the rail wheel.
3. The apparatus of claim 2 wherein the stop member comprises a pin
extending through a stop aperture defined by the first bracket.
4. The apparatus of claim 3 wherein the first bracket comprises a
pair of legs oriented such that the second bracket moves up and
down between the legs, and wherein the pin extends through stop
apertures in both legs.
5. The apparatus of claim 4 wherein the stop mechanism further
comprises a lock operative to selectively lock the first and second
brackets together when the rail wheel is in the raised road mode
position, such that the rail wheel is prevented from moving
downward.
6. The apparatus of claim 5 wherein the lock comprises a lock
aperture defined by the second bracket, the lock aperture oriented
to coincide with the stop apertures when the rail wheel is in the
raised road mode position such that the pin can be inserted through
the stop apertures and lock aperture.
7. The apparatus of claim 2 wherein the stop mechanism further
comprises a lock operative to selectively lock the first and second
brackets together when the rail wheel is in the raised road mode
position, such that the rail wheel is prevented from moving
downward.
8. A kit for use with a road/rail vehicle, the vehicle convertible
from a road, mode for traveling on a road, to a rail mode for
traveling on a set of rails, the vehicle when in rail mode
supported on a rail wheel by an air bag, the vehicle including a
source of pressurized fluid operatively connected to the air bag to
supply pressurized fluid to the air bag such that the air bag bears
against the rail wheel and against a vehicle frame and such that
the vehicle frame can move up and down with respect to the rail
wheel in response to motion of the vehicle along the set of rails,
the vehicle further including a control to release the pressurized
fluid from the air bag and an actuator operatively connected to the
vehicle frame and to the rail wheel, the actuator operative to
selectively move the rail wheel from a raised road mode position to
a lowered rail mode position, the kit comprising: a stop mechanism
attachable to the vehicle frame and to the rail wheel, the stop
mechanism operative to allow the vehicle frame to move down with
respect to the rail wheel only to a stopped position wherein
adjacent road wheels of the vehicle are above the rails; and
wherein the stop mechanism is selectively operative to lock the
rail wheel in the raised road mode position.
9. A kit for use with a road/rail vehicle, the vehicle convertible
from a road mode for traveling on a road, to a rail mode for
traveling on a set of rails, the vehicle when in rail mode
supported on a rail wheel by an air bag, the vehicle including a
source of pressurized fluid operatively connected to the air bag to
supply pressurized fluid to the air bag such that the air bag bears
against the rail wheel and against a vehicle frame and such that
the vehicle frame can move up and down with respect to the rail
wheel in response to motion of the vehicle along the set of rails,
the vehicle further including a control to release the pressurized
fluid from the air bag and an actuator operatively connected to the
vehicle frame and to the rail wheel, the actuator operative to
selectively move the rail wheel from a raised road mode position to
a lowered rail mode position, the kit comprising: a stop mechanism
attachable to the vehicle frame and to the rail wheel, the stop
mechanism operative to allow the vehicle frame to move down with
respect to the rail wheel only to a stopped position wherein
adjacent road wheels of the vehicle are above the rails, and
wherein the stop mechanism comprises: first and second brackets,
one of the brackets attachable to the rail wheel and the other
attachable to the vehicle frame such that the brackets are oriented
to move up and down beside and in proximity to each other; a stop
member removably attached to the first bracket, and extending
toward the second bracket such that when the vehicle frame moves
down to the stopped position the second bracket comes into contact
with the stop member and prevents the vehicle frame from moving
further downward with respect to the rail wheel.
10. The kit of claim 9 wherein the stop member comprises a pin
extending through a stop aperture defined by the first bracket.
11. The kit of claim 10 wherein the first bracket comprises a pair
of legs oriented such that the second bracket moves up and down
between the legs, and wherein the pin extends through stop
apertures in both legs.
12. The kit of claim 11 wherein the stop mechanism further
comprises a lock operative to selectively lock the first and second
brackets together when the rail wheel is in the raised road mode
position, such that the rail wheel is prevented from moving
downward.
13. The kit of claim 12 wherein the lock comprises a lock aperture
defined by the second bracket, the lock aperture oriented to
coincide with the stop apertures when the rail wheel is in the
raised road mode position such that the pin can be inserted through
the stop apertures and lock aperture.
14. The kit of any one of claims 11, 12, or 13 wherein the first
bracket is attachable to a rail wheel assembly at a point below the
air bag such that the legs extend upward adjacent to the air bag,
and wherein the second bracket is attachable to the vehicle frame
at a point above the air bag, and wherein the second bracket
includes an arm extending downward adjacent to the air bag.
15. The kit of claim 14 wherein the air bag is attached to an
existing baseplate at a lower end thereof, and wherein the kit
further comprises a replacement baseplate, and wherein the first
bracket is attached to the rail wheel assembly by replacing the
existing baseplate with the replacement baseplate.
16. The kit of claims 11, 12, or 13 wherein the first bracket is
attachable to the vehicle frame at a point above the air bag such
that the legs extend downward adjacent to the air bag, and wherein
the second bracket is attachable to a rail wheel assembly at a
point below the air bag, and wherein the second bracket includes an
arm extending upward adjacent to the air bag.
17. The kit of claim 16 wherein the air bag is attached to an
existing baseplate at a lower end thereof, and wherein the kit
further comprises a replacement baseplate, and wherein the second
bracket is attached to the rail wheel assembly by replacing the
existing baseplate with the replacement baseplate.
18. The kit of claim 9 wherein the stop mechanism further comprises
a lock operative to selectively lock the first and second brackets
together when the rail wheel is in the raised road mode position,
such that the rail wheel is prevented from moving downward.
Description
This invention is in the field of vehicles for road and rail use
and in particular the suspension of such vehicles.
BACKGROUND
Vehicles adapted for road and rail use are well known. Commonly a
truck or highway tractor will include conventional rubber tired
wheels for road use, and a set of rail wheels which allow the truck
to travel on railway lines. Short-line railways have made such
convertible highway tractors, or road/rail power units, popular for
economically pulling small numbers of rail cars on low volume rail
lines. Conventional railways also use them for shunting,
maintenance, and like jobs where large locomotives are not required
and are uneconomical. The road/rail power units are more versatile
than locomotives as they allow for direct movement between rail
lines on roads. Towed vehicles are also known that convert from
road to rail modes.
The suspension of such vehicles typically includes some apparatus
to raise and lower the rail wheels, and may further include
mechanisms for raising at least some road wheels. It is necessary
that those wheels of either kind that are not being used are
removed from the road or rail so as not to interfere with the
operation of the vehicle in the particular mode it is operating
in.
Air bag suspensions are popular to support the vehicle on the rail
wheels in rail mode as they allow the desired degree of movement to
provide a smooth ride. Some give is desired to cushion the vehicle
from variations in the track, such as uneven joints between rails.
Air bags are preferred over springs as they can be collapsed to
allow the rail wheels to be raised when the vehicle converts to
road mode. Typically an actuator such as a hydraulic cylinder is
used to move the rail wheels up into road mode and down into rail
mode. The hydraulic cylinder typically extends or retracts to move
the rail wheels down and then the air bag is inflated between the
rail wheel and the vehicle frame to support the vehicle with
adjacent road wheels raised above the rails. Pressure is then
released from the hydraulic cylinder so that same floats, allowing
the vehicle to move up and down with respect to the rail wheels on
the cushion provided by the air bag.
Typically to convert to road mode, the air pressure in the air bag
is released so that the vehicle moves down to rest on the adjacent
road wheels. Some of the road wheels might also be raised when
moving into rail mode. In that case, those road wheels are
typically first lowered before the air pressure in the air bag is
released. When the air pressure is released, the hydraulic cylinder
is then reversed to raise the rail wheels into the raised road mode
position, wherein the air bag is collapsed. A chain or the like is
used to secure the rail wheels in the raised road mode
position.
A problem with the air bag suspension is that the air bag can fail,
allowing the vehicle to drop. The adjacent road wheels may then
contact the rail or ties, causing damage to the vehicle or rail
bed, or even derailing the vehicle.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an air bag
suspension apparatus for mounting a rail wheel to a convertible
road/rail vehicle that prevents adjacent road wheels of the vehicle
from contacting the rails while allowing the suspension to cushion
the vehicle while traveling on a set of rails in rail mode.
It is a further object of the invention to provide such an
apparatus that also locks the rail wheels in a raised position for
vehicle travel on a road in road mode.
It is a further object of the invention to provide such an
apparatus in kit form that can be attached to existing road/rail
vehicles.
The invention provides, in one aspect, for use with a road/rail
vehicle, the vehicle convertible from a road mode for traveling on
a road, to a rail mode for traveling on rails, an apparatus for
mounting a rail wheel to the vehicle. The apparatus comprises an
air bag and a source of pressurized fluid operatively connected to
the air bag to supply pressurized fluid to the air bag such that
the air bag bears against the rail wheel and against the vehicle
frame such that the vehicle frame is supported on the rail wheel by
the air bag and such that the vehicle frame can move up and down
with respect to the rail wheel in response to motion of the vehicle
along a set of rails. A control is operative to release pressurized
fluid from the air bag. An actuator is operatively connected to the
vehicle frame and to the rail wheel, the actuator operative to
selectively move the rail wheel from a raised road mode position to
a lowered rail mode position. A stop mechanism is attached to the
vehicle frame and to the rail wheel and is operative to allow the
vehicle frame to move down with respect to the rail wheel only to a
stopped position; and wherein adjacent road wheels of the vehicle
are above the rails in the stopped position.
The invention provides, in a second aspect, a kit for use with a
road/rail vehicle, the vehicle convertible from a road mode for
traveling on a road, to a rail mode for traveling on rails, the
vehicle when in rail mode supported on a rail wheel by an air bag,
the vehicle including a source of pressurized fluid operatively
connected to the air bag to supply pressurized fluid to the air bag
such that the air bag bears against the rail wheel and against the
vehicle frame and such that the vehicle frame can move up and down
with respect to the rail wheel in response to motion of the vehicle
along a set of rails, the vehicle further including a control to
release the pressurized fluid from the air bag and an actuator
operatively connected to the vehicle frame and to the rail wheel,
the actuator operative to selectively move the rail wheel from a
raised road mode position to a lowered rail mode position. The kit
comprises a stop mechanism attachable to the vehicle frame and to
the rail wheel, the stop mechanism operative to allow the vehicle
frame to move down with respect to the rail wheel only to a stopped
position wherein adjacent road wheels of the vehicle are above the
rails.
The apparatus allows the vehicle to move up and down with respect
to the rail wheels so that the suspension can cushion the vehicle,
while preventing the adjacent road wheels from coming into contact
with the rails or rail bed should the air bag fail. The apparatus
can also readily incorporate a lock to secure the rail wheels in
the raised road mode position for travel on the road.
DESCRIPTION OF THE DRAWINGS
While the invention is claimed in the concluding portions hereof,
preferred embodiments are provided in the accompanying detailed
description which may be best understood in conjunction with the
accompanying diagrams where like parts in each of the several
diagrams are labeled with like numbers, and where:
FIG. 1 is a schematic side view of a prior art suspension for a
road/rail vehicle in rail mode;
FIG. 2 is a front view of an apparatus of the invention in rail
mode;
FIG. 3 is a side view of the apparatus of FIG. 2 in rail mode;
FIG. 3A is a side view of the brackets of the apparatus of FIG. 3
in the stopped position;
FIG. 4 is a schematic side view of a prior art suspension for a
road/rail vehicle in road mode;
FIG. 5 is a front view of the apparatus of FIG. 2 in road mode;
FIG. 6 is a side view of the apparatus of FIG. 2 in road mode;
FIG. 7 is a perspective view of a kit for installing the apparatus
of FIG. 2 on an existing suspension.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
FIGS. 2, 3, 5, and 6 illustrate, for use with a road/rail vehicle
convertible from a road mode for traveling on a road, to a rail
mode for traveling on rails, an apparatus 1 for mounting a rail
wheel to the vehicle. The apparatus 1 comprises an air bag 2 and a
conventional source of pressurized fluid (not illustrated) is
operatively connected to the air bag 2 to supply pressurized air or
similar fluid. A control is operative to release pressurized fluid
from the air bag 2.
A rail wheel assembly 4 includes a rail wheel 6 rotatably mounted
to one end of a pivot member 8. The opposite end of the pivot
member 8 is pivotally mounted to the vehicle frame 10 at frame
member 11. An actuator, such as the illustrated hydraulic cylinder
12, is operatively connected to the vehicle frame 10 and to the
pivot member 8 and is operative to selectively move the rail wheel
6 from a lowered rail mode position as illustrated in FIG. 1 for
traveling on a set of rails 16, to a raised road mode position, as
illustrated in FIG. 4 for traveling on a road 14. FIGS. 1 and 4
illustrate an example of a prior art suspension, where the air bag
2 is pressurized in FIG. 1, and collapsed in FIG. 4. Other
configurations are known in the art as well, and other
configurations of the apparatus of the present invention could be
readily adapted to such other configurations.
The air bag 2 bears against the rail wheel assembly 4 and against
the vehicle frame 10 such that the vehicle frame 10 is supported on
the rail wheel 6 by the air bag 2. Once the air bag 2 is
pressurized, pressure is released from the hydraulic cylinder 12 so
that same can float, allowing the vehicle frame 10 to move up and
down with respect to the rail wheel 6 in response to motion of the
vehicle along rails 16.
A stop mechanism 20 is attached to the vehicle frame 10 and to the
rail wheel assembly 4. As seen in FIG. 3, the stop mechanism 20 is
operative to allow the vehicle frame 10 to move down with respect
to the rail wheel 6 only to a stopped position, illustrated in FIG.
3A. The adjacent road wheels 18 of the vehicle are above the rails
16 in the stopped position.
The stop mechanism 20 is further selectively operative to lock the
rail wheel assembly 4 in the raised road mode position illustrated
in FIG. 4.
In the illustrated embodiment of FIGS. 2, 3, 5, and 6, the stop
mechanism 20 comprises first and second brackets 21, 22. One of the
brackets 21, 22 is fixed to the rail wheel assembly 4 and the other
is fixed to the vehicle frame 10. The brackets 21, 22 are oriented
to move up and down beside and in proximity to each other.
As illustrated, the first bracket 21 comprises a pair of legs 23
and is attached to the air bag mounting member 26 extending down
from the vehicle frame 10 above the air bag 2. The first bracket 21
is oriented such that the legs 23 extend downward adjacent to the
air bag 2. The second bracket 22 is attached to an air bag mounting
flange 29 extending out from the pivot arm 8 below the air bag 2.
The second bracket 22 includes an arm 24 extending upward adjacent
to the air bag 2 and is oriented such that the arm 24 moves up and
down between the legs 23 of the first bracket 21. of course the
first bracket 21 with legs 23 could be alternatively mounted below
the air bag 2 with the legs 23 extending up instead of down, and
the second bracket 22 mounted above the air bag 2 with the arm 24
extending down. The function would be the same.
A stop member, illustrated as pin 30, is removably attached to the
first bracket 21 by insertion through stop apertures 32 in the legs
23. When the vehicle frame 10 moves down to the stopped position,
as illustrated in FIG. 3A, the top end of the second bracket 22
comes into contact with the pin 30 and prevents the vehicle frame
10 from moving further downward with respect to the rail wheel 6.
In the stopped position, the adjacent road wheels 18 are above the
rails 16. The stopped position is the lower end of an allowable
range of up and down travel of the vehicle frame 10 with respect to
the rail wheel 6. The vehicle is thus cushioned through that range,
while at the same time prevented from falling to a level where the
adjacent road wheels 18 hit the rails 16.
The first bracket 21 could also comprise a single leg 23, with the
pin 30 extending through a stop aperture 32 therein and toward the
second bracket 22, however the second leg 23 provides a stronger
structure, supporting both ends of the pin 30. The two leg
configuration provides a strong, simple stop mechanism 20. The legs
23 also prevent the arm 24 from bending away from the pin 30. With
this embodiment, the vehicle can be driven on the rail wheel 6
while resting on the stop mechanism 20 in the event of an air bag
failure, saving the considerable expense of remote repairs and
down-time.
In the illustrated embodiment of FIGS. 2, 3, 5, and 6 the stop
mechanism 20 further comprises a lock 35 operative to selectively
lock the first and second brackets 21, 22 together when the rail
wheel 6 is in the raised road mode position, such that the rail
wheel 6 is prevented from moving downward. The lock 35 comprises a
lock aperture 37 defined by the second bracket 22 and oriented to
coincide with the stop apertures 32 when the rail wheel 6 is in the
raised road mode position as illustrated in FIG. 6, such that the
pin 30 can be inserted through the stop apertures 32 and lock
aperture 35.
FIG. 7 illustrates the components of the illustrated embodiment in
a kit form for installing the stop mechanism 20 on an existing
suspension of the configuration illustrated in FIGS. 1 and 4. The
kit includes a first bracket 21 attachable by bolts to the air bag
mounting member 26. The air bag 2 is attached to an existing
baseplate 40 at a lower end thereof. The kit includes a replacement
baseplate 41. To attach the second bracket 22 to the rail wheel
assembly 4, the existing baseplate 40 is removed and replaced by
the replacement baseplate 41. Holes are drilled through the air bag
mounting flange 29, and the second bracket 22 is bolted through
these holes to the replacement baseplate 41.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous changes and modifications
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly, all such suitable changes or
modifications in structure or operation which may be resorted to
are intended to fall within the scope of the claimed invention.
* * * * *